PU-COATED FABRIC ADHESION: WHAT BUYERS SHOULD ASK THE LABORATORY

Name the bond question before requesting a peel number

A buyer may describe lifting, flaking or separation as delamination, but that description alone does not identify the material boundary involved. Send a labelled construction description and explain where the problem appears: the coating against the base cloth, a bonded backing, or a separate seam tape. Ask the laboratory which procedure can address that boundary. These are different components of the finished assembly, so a result for one must not be presented as approval of all the others. If the sample cannot be prepared for the proposed procedure, record the limitation and agree the next investigation rather than requesting an unsupported passing figure.

Use ISO 2411 as a method reference, not a performance badge

The official ISO catalogue lists ISO 2411:2024 as the published fifth edition for determining coating adhesion strength of coated fabrics. The public abstract establishes that subject; it does not provide the buyer's acceptance threshold or all procedural details. A competent laboratory should use the controlled full procedure and confirm applicability to the supplied fabric. Request the exact method and edition in the quotation and report. Avoid turning a catalogue finish description into a claim of ISO certification. For a multilayer laminate, seam tape or another bond, have the laboratory assess the appropriate method rather than assuming a coating-adhesion reference automatically covers it.

Keep the tested fabric identity complete

Record the article or model, base construction, coating route, colour, finish, sample reference and lot where available. A clear PU coating and a milky PU coating are useful catalogue distinctions, but neither phrase defines a bond result. The same model name also should not erase a documented change in substrate, finish or supplied assembly. Ask which report matches the offered sample and which changes require renewed evidence. Retain a controlled reference sample and the report together so the converter can identify what was actually approved. This traceability recommendation is a purchasing safeguard, not a claim that every production change causes a failure.

• Link the report to the article and sample identity.
• Record coating and substrate changes instead of silently reusing evidence.

Agree initial and after-treatment evidence separately

A new sample and a sample after an agreed care or exposure procedure answer different purchasing questions. Describe the intended use and ask the laboratory whether additional treatment and evaluation are appropriate. Where laundering, folding, heat or other exposure is relevant, the technical owner should define the procedure, conditions and acceptance rule before the trial. Do not invent a number of wash cycles or equate an initial adhesion result with durability throughout service. Keep treatment history visible in the report and distinguish completed testing from development still planned. The exact programme depends on the offered construction and the buyer's application, not simply the term outdoor fabric.

Read the observations alongside the reported result

Ask the laboratory to describe what was observed during the test and explain any limitation affecting interpretation. A numerical result without the sample identity, method, units and observations can be difficult to compare with another supplier's report. Have the technical reviewer decide whether the evidence answers the specified bond question; do not diagnose the cause of a separation from a photograph alone. If the specimen or preparation prevents a valid measurement, report that clearly. Treat unusual results as a reason for a controlled follow-up, not as permission to substitute a convenient test or claim that the coating passed because no simple separation was obtained.

Review actual coated constructions without assuming a pass

Two published Tec-Tent references provide relevant starting points. PT1/BUDO6E is a 190T polyester taffeta with a clear PU-coating route and face-side embossing, listed at 66 gsm ±5 gsm with a 58-inch cuttable width. PTA2/RXOO6L is a 100% polyester 190T FD taslan with a PU milky-coating route, listed at 135 gsm ±5% and 147 cm cuttable width. The constructions differ, so keep their samples and evidence separate. Neither public record supplies a coating-adhesion test result. Discuss the intended tent or rainwear position first, then request article-specific samples and a suitable verification plan rather than ranking adhesion from weight or finish appearance.

Separate adhesion approval from the finished product

A coating bond result is only one input to acceptance. Water penetration, surface wetting, fabric mechanical properties and the behaviour of sewn or sealed assemblies require their own specifications where relevant. A fabric-level report does not establish that a complete tent or garment will meet every requirement after conversion. Identify the responsible party for component and finished-product assessment, and retain unresolved checks as open items. This keeps technical approval useful to the converter without expanding it into a waterproofness, lifetime or regulatory promise that the evidence does not support.

Send a short, controlled technical enquiry

Include the end product, fabric position, preferred article, coating and substrate description, reference sample, known failure concern, quantity and sample deadline. Attach the buyer's bond clause if one exists and ask which existing evidence matches the exact offer. Request confirmation of the proposed method, edition, sample preparation, treatment history, units and acceptance responsibility before testing starts. Mark unknowns explicitly. Use the Products directory to review current constructions and request the relevant tent or rainwear catalogue when a broader shortlist is needed. A well-defined question helps distinguish an available construction, a close alternative and a development route without promising an unverified result.

• Name the bond and application, not only a target force.
• Separate existing evidence from proposed testing.
• Agree acceptance criteria with the buyer and laboratory before approval.